<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <style>
        #container {position: absolute; width: 80%; height: 100%;}
        #nav {width: 30%; height: 100%; background-color: aliceblue;}
        #content {width: 30%; height: 100%; background-color: cadetblue;}
        * {padding: 0; margin: 0;}
    </style>
</head>
<body>
<div id="container">
    <div id="nav"></div>
    <div id="content"></div>
</div>
</body>
</html>